[9.1] [ML] Restore delayed string copying (#135242) #135464
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This commit restores the behaviour introduced in elastic#125837 which was inadvertently undone by changes in elastic#121041, specifically, delaying copying Strings as part of calling Request.chunkText() until the request is being executed. In addition to the above change, refactor doChunkedInfer() and its implementations to take a List<ChunkInferenceInput> rather than EmbeddingsInput, since the EmbeddingsInput passed into doChunkedInfer() was immediately discarded after extracting the ChunkInferenceInput list from it. This change allowed the EmbeddingsInput class to be refactored to not know about ChunkInferenceInput, simplifying it significantly. This commit also simplifies EmbeddingRequestChunker.Request to take only the input String rather than the entire list of all inputs, since only one input is actually needed. This change prevents Requests from retaining a reference to the input list, potentially allowing it to be GC'd faster. (cherry picked from commit f3447d3) # Conflicts: # x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/ai21/Ai21Service.java # x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/llama/LlamaService.java # x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/llama/action/LlamaActionCreator.java # x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/mistral/MistralService.java # x-pack/plugin/inference/src/test/java/org/elasticsearch/xpack/inference/services/SenderServiceTests.java # x-pack/plugin/inference/src/test/java/org/elasticsearch/xpack/inference/services/alibabacloudsearch/AlibabaCloudSearchCompletionRequestManagerTests.java # x-pack/plugin/inference/src/test/java/org/elasticsearch/xpack/inference/services/alibabacloudsearch/action/AlibabaCloudSearchActionCreatorTests.java # x-pack/plugin/inference/src/test/java/org/elasticsearch/xpack/inference/services/azureaistudio/action/AzureAiStudioActionAndCreatorTests.java # x-pack/plugin/inference/src/test/java/org/elasticsearch/xpack/inference/services/llama/action/LlamaActionCreatorTests.java
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